Zigzag machine with two needles and two hooks



July 9, .1940. s ZQN|$ 2,207,141

- ZIGZAG MACHINE WITH TWO NEEDLES AND 'rwo HOOKS Filed Dec. '7, 1937 8 Sheets-Sheet 1 July 9, 1940. s. zoms ZIGZAG MACHINE WITH TWO NEEDLES AND TWO HOOKS Filed Dec. 7, 1957 8 Sheets-Sheet 2 Sydney zon/z's Wi Vwe/om W7 g July 9, 1940. s zoms v I 2,207,141

' ZIGZAG MACHINE WITH TWO NEEDLES AND 1W0 HOOKS Filed Dec. '7, 1937 8 Sheets-Sheet 5 Sydngy Zonz's ammo/14M V y 9, 1940 s. ZONIS 2,207,141

ZIGZAG MACHINE WITH TWO NEEDLES AND TWO HOOKS Filed Deb. 7, 1957 a Sheets-Sheet 4 July 9, 1940.

ZIGZAG s. zoms 2,207,141

MACHINE WITH TWO NEEDLES AND TWO HOOKS Z4 3g; I 5 26 56 w/l July 9, 1940.

s. zoms ZI GZAG MACHINE WITH TWO NEEDLES AND TWO HOOKS 8 Sheets-Sheet 6 Filed Dec. 7, 1957 y 9, 1940- s. zoms 2,297,141

ZIGZAG MACHINE WITH TWO NEEDLES AND TWO HOOKS Filed Dec. 7, 1957 a Sheets-Sheet v awe/14M Syn inf}! Zen/is 7 July 9, 1940. s. ZONIS ZIGZAG MACHINE WITH TWO NEEDLES AND TWO HOOKS Filed Dec. 7, 1937 8 Sheets-Sheet 8 gwuwvbo'r/ Sydney Zonal;

- mechanism laterally of the line of seam forma-- Patented July 9, 1940 ZIGZAG MACHINE WITH TWO NEEDLES TWO HOOKS Sydney Zonis, Bridgeport, Conn, assignor to The Singer Manufacturing Company,

Elizabeth,

N. .l., a corporation of New Jersey Application December 7, 1937, Serial No. 178,477

13 Claims. (Cl. 112159) tion and for adjusting the actuating mechanism which vibrates the needle and its cooperating loop-taker laterally of the line of seam formation.

Another object of this invention is to provide a plurality of eccentrics which are simultaneously adjustable by-a single adjusting means.

A further object of this invention is to provide a new and novel actuating mechanism for the feed-bar. A still further object is to provide improved means of mounting a loop-taker for lateral movement.

Another object is the provision of a rotary hook operating about a vertical axis and mounted to swing or vibrate laterally on a vertical axis.

Another object is to locate the pivotal point ment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

Figure 1 is a side elevation of a machine embodying my invention with portions of the machine cut away to expose the operating parts.

Figure 2 is a bottom plan view.

Figure 3 is a front end elevation of the machine, with the face plate removed and the bed partly cut away to expose the mechanism below the bed.

Figure 4 is a sectional view taken substantially along the line 4--4 of Figure 2.

Figure 5 is a rear end elevation of the machine, the frame being in section to expose the actuating mechanism.

Figures 6 and 7 are sectional views taken along the lines 66 and 1'! of Figure 5.

Figure 8 is a sectional view taken substantially along the line 8-8 of Figure 3,

the shaft l4.

Figure 9 is a vertical section through a pair of the actuating eccentrics.

Figure 10 is an enlarged detailed view of the vertical axis hook, its supporting and actuatingmechanism, and the feeding mechanism.

Figure llisa detailed section taken along the line ll-H of Figure 10.

Figure 12 is an enlarged detailed plan view of the connection between the vibratory sleeve and one end of the loop-taker frame.

Figure 13 is a rear elevation of a portion of the head of the machine.

Figure 14 is a front elevation of a portion of the head of the machine showing the tension devices.

Figure 15 is a diagrammatic view illustrating the change in timing of the hook-beaks relative to their respective needles as a result of being swung about their pivot points.

Figure 16 is an enlarged detailed view partly in section, of the mechanism for actuating the feed-dog.

In the embodiment of this invention selected for illustration l0 represents the bed of the machine which carries the standard It and overhanging bi'acket-arm l2 which terminates in a hollow head l3. Joumaled in bearings in the bracket-arm is a rotary needle-bar actuating shaft I4 having fixed to one of its ends the usual crank disk I 5 and to its other end a balance wheel 16 having a pulley groove IT.

The shaft M has fixed to it a gear l8 meshing with a gear l9 fixed to the auxiliary hollow shaft 20, which is arranged at right angles to The auxiliary shaft 20 has fixed to it by the set screws 20 a disk 2| and secured by the pivot screw 22', to one side of the disk is the flange 22 of an adjustable eccentric 23 (Figs. 6, '7 and 9).

Diametrically opposite the pivot screw 22' is a shouldered screw 24 which extends through the arcuate slot 25 in the ,flange 22- and into the disk 2| to limit the movement of the eccentric 23 and to hold the eccentric against the disk.

Pivotally secured bya pivot screw 26 to the other side of the disk 2| is a flange 21 of a second eccentric 28. A shouldered screw 29 passes through an arcuate slot 30 in the flange 21 and is screwed into the disk 2!. The flange 21 of the eccentric 28 is provided with a radial bore which is tapped to receive the threads on a screw 32 formed with a reduced portion 33 which enters an aperture 34 in the shaft 20. The screw 33 may be adjusted and is held in its adjusted position by a jam screw 35. Diametrically opposite the adjusting screw 32 a plunger 36 is urged against the shaft 20 by a coiled spring 31 which reacts against a screw 38. On the flange 22 of the eccentric 23 there is provided an adjustable stop screw 39 which is adapted to engage the periphery of the shaft 20 and is held in its adjusted position by a jam screw 40. Also in the flange 22 and diametrically opposite the stop screw 39 is a plunger M which is spring urged against the shaft 20 by a spring 42. The two eccentrics are connected together by a link 44 having a centrally arranged offset. (Figures 5 and 7.) One end of the link is pivotally secured to the flange 22 of the eccentric 23 by a pivot pin 45 and the other end is pivotally secured to the flange 21 by a pivot pin 46. From the foregoing it will be observed that the link 44 ties the two eccentrics 23 and 28 together so that when the throw of one eccentric is varied the throw of the other eccentric will be varied an equal amount in the opposite direction.

Extending into the longitudinal bore in the hollow shaft 20 is an adjusting rod 48 (Fig. 9) having an enlarged portion 49 formed on one end with an inclined surface 50 which engages the reduced portion 33 of the adjustable screw 32 to thereby adjust the throw the eccentrics. To prevent the adjusting rod being removed and also from turning relative to the shaft 20 a screw 5| enters the enlarged portion 49 of the rod and the head of the screw is guided by the walls of a slot 52 in the shaft 20. A threaded sleeve 53 embraces the reduced portion 48 and one of its ends engages the shoulder of the enlarged portion 49, the shoulder being held against the end of the sleeve by the nuts 56 on the other end of the rod 48. The sleeve 53 is provided with a knob 54 which is knurled and a fiat spring 55 which engages the shaft 20 to increase friction. From the above it will be obvious that by turning the sleeve 53 the threaded portion, which coacts with the corresponding threads in the bore of the shaft 20, will cause the rod 48 to move in or out depending upon the direction that the sleeve is turned. This movement of the adjusting rod causes the inclined portion 50 of the rod, through the screw 32, to move the axes of the adjustable eccentrics 23 and 28 into or out of alignment with the axis of the shaft 20.

The eccentrics 60 and 6| on the other side of the gear I9 and their adjusting mechanism are similar to the eccentrics 23 and 28 and their adjusting mechanism. It will be understood that the eccentrics 60, 6I are arranged on the shaft 20 so that the needles move towards each other and away from each other simultaneously. It will be obvious, however, that the eccentrics may be arranged to move the needles in the same direction simultaneously.

Journaled in the. hollow head I3 are two spaced parallel slide rods 63 and 64. Fixed to the slide bar 63 by a set screw 65 is a bearing bracket or sleeve 66 having an enlarged end 61 aperturedto slidably receive the rod 64. Fixed tothe rod 64 by the set screw 68 is a second bearing bracket or sleeve 69 with an enlarged apertured end 10 which embraces and is slidable on the rod 63. Journaled for reciprocatory endwise movement in the sleeves 66 and 89 are the needle-bars 10a and 1| carrying needles 10' and H. The needle-bars 10a and II are reciprocated by means of a T- shaped link 12 having one of its ends pivotally secured to a pin on the crank disk I5 a'id its other end formed with a rod 13 which is s...dably embraced by the slide blocks 14 and 15 fixed to the upper ends of the respective needle-bars. The T-shaped link 12 is guided to a right line movement by the means of a slot 18 formed in the hollow head I3 and which receives one end of the rod 13.

A take-up lever 11 is pivoted to the head of the machine 18 and is actuated by the crank disk I5 by means of the sleeve 19 and rod 80 in the usual and well known manner. Also journaled in the hollow head is the usual presserbar 82 carrying a presser-foot 83. A member 84 (Figure 8) having a split hub portion which is clamped to the presser-bar has three laterally extending arms 85, 86 and 81. The end of the arm 85 is slidably received by a slot in a post 88 fixed to the head of the machine and the presserbar 82 is thus prevented from turning about its longitudinal axes in its bearing. The arm 81 is formed with an upstanding portion 90 which is adapted to engage a pin 9| extending through the head of the machine. The pin 9I cooperates, in the usual and well known manner, with the tension devices 92 to release the tension when the presser-foot is raised. The arm 86 extends towards the rear of the machine and overlying the arm near the hub is one end of a spring 94 which has its other end pivotally secured at 95 to the bracket arm. The spring reacts near its center portion with the adjusting screw 98 to constantly urge the presser-bar downwardly. The presserbar may be raised and lowered by means of a lever 99 pivoted to the head of the machine at I and having a cam portion IOI which cooperates with the arm 86 in the usual and well known manner.

Journaled beneath the bed in the bearing lugs I05, I08 and I01 is a rotatable shaft I08 having fixed to one of its ends a pulley I09 which is driven from the needle-bar actuating shaft by means of a pulley I II fixed on the upper shaft and a clip belt I I 0. A bearingbushing II 2 extends beyond the bearing lug I 06 and clamped to the bushing is the split hub II3 of a saddle H4. The saddle I I4 is adjustably secured to the bed I0 by means of an L-shaped bracket H and the screws II6. A hearing bushing II1 extends beyond the bearing lug I01 and is embraced by the split hub II8 of a second saddle II9 which is adjustably secured to the bed of the machine by means of the L-shaped bracket I20 and the screws I2I. A hook supporting frame I22 has one of its ends pivoted on a short shaft I23 which is journaled in the saddle I I9 and its other end pivotally secured by the stud I24 to a rod I25 journaled for endwise reciprocatory movement in the bearing lugs I 26. A second hook supporting frame I28 has one of its ends pivoted on the short shaft I29 which is journaled in the saddle H4 and its other end pivoted on a stud I30 fixed to a sleeve I3I which is slidable on the rod I 25 and in the bearing lug I32.

Fixed to the shaft I08 is a gear I35 which meshes with a gear I36 fixed to the short vertical shaft I29. The ratio of these gears is as 1:2, therefore the shaft I29 makes two complete revolutions for each revolution of the shaft I08. The gear I36 meshes with a gear I 31 fixed to a shaft I38 journaled in hearings in the supporting frame I28 (Figures 2 and Fixed to the other end of the shaft I38 is a gear I39 meshing with a gear I40 fast on the vertical shaft I4I which carries at its upper end a rotary hook I42. Fixed to the shaft I 38 is an eccentric I43, which actuates through the yolk I44 a pivoted arm I45, a bobbin-case opener I46. A rotation restraining rotations for each rotation of the gear-I49. The

gear I50 meshes with a gear I5I on the shaft I52 which is journaled in the supporting frame I22. The shaft I52 has fixed to it a gear I53 meshing with a gear I54 carried by a vertical shaft I55 1 which has secured to its upper end the hook I51.

A bobbin-case opener I60 similar to that derestraining fingers I6! and I62 are carried by the scribed for the hook I42 is provided. Rotation frame I22 and receive between their free ends a lug I83 carried by the bobbin-case I64. The above described hook and actuating mechanism therefor is similar to that shown and described in the patent to W. Myers, No. 1,999,978, dated Apr. 30, 1935.

It will be understood that the frame I22 and hook I51 are pivoted to swing in the arcs of circles about the center of the shaft I23 as an axis, therefore, some play must be allowed in the connection between the slide rod I25 and the end of the frame I22. As shown in Figure 11 the connection comprises a stud I24 formed with a hub I66 which is fixed to the rod I25 by a set screw I61, the end of the frame I22 being held on the stud by a cap screw I68. It will be noted that there is sufficient clearance between the stud I24 and also the collar I69 and the apertures in the end of the frame I 22 to avoid cramping when the hook and frame are shifted. As shown in Figure 12 there is sufiicient clearance between the stud I30 and the aperture in the end of the frame I28 to permit the frame to swing about its pivot. A screw I10 is provided to hold the end of the frame I28 on the stud I30.

To vibrate the loop-taker I51 and its frame I22 the rod I25h'as fixed to it a pivot pin IT! to which one endof a link I12 is pivotally secured. The other end of the link I12 is pivotally secured to one end of a bell-crank lever I14 which is rockably supported on a shaft I15 journaled transversely in the standard of the machine. The other arm of the bell-crank lever I14 is pivotally secured to one end of a pitman I16 which has a strap embracing the eccentric SI. The eccentric 60, which is connected to the eccentric Si by a link 60', is connected by the pitman I84 to the slide rod 64 which controls the lateral position of the needle-bar II.

To vibrate the loop-taker I42 and the frame I28 there is secured to the sleeve I3I a pivot stud I 80. A link I8l has one of its ends embracing the pivot stud I and its other end pivotally secured to one arm of a bell-crank lever I82 carried by the shaft I15. The other arm of the bellcrank lever I82 is pivotally secured to a pitman I83 which has a strap embracing the eccentric 23. The eccentric 23 is connected by the link 44 to the eccentric 28 which actuates a pitman I84 connected to the rod 83 which controls the lateral position of the needle-bar 10*. From the foregoing it will be obvious that the two eccentrics 23 and 28 are connected by a link so that they may be adjusted the same amount by a single adjusting means. Therefore, when the lateral throw of the needle-bar is varied the throw of the cooperating hook is varied the same amount and consequently the needle and its cooperating hook are adjusted simultaneously and retain at all times their positions relative to each other. The eccentrics 60 and 6| are connected by'a link 60' and are identical in size and shape with the eccentrics 23 and 28, and, therefore, the needle 1I' and its cooperating hook are adjusted by a single means and also maintain their positions relative to each other at all times regardless of the lateral throw. It will be understood that the positions of the pivot points for the links I16 and I83 and the bell-crank levers I14 and I82 are selected with respect to the centers of their actuating eccentrics,- and the location of the needle-bar slide-rods 68 and 64 are also selected relative to the center of their actuating eccentrics so that each needle-bar and its cooperating book are displaceed laterally an equal distance for a given throw of the eccentrics.

As illustrated in Figure 15 the needles 10 and H move in a straight line and the hooks I42 and I51 swing in the arc of a circle about the pivot points I28 and I29. As indicated by the the full and dotted line position of the parts, when the hooks swing away from each other the beak I42 of the hook I42 would be advanced and the beak I51 would be retarded relative to their respective needles if no provisions were made for keeping the hook-beaks in time. To obviate this difliculty the gears I35 and I36 are so arranged that the gear I36 will rotate in a clockwise direction, as viewed in Fig. 10, and the teeth of the gear I31 are cut on an angle so that when the hook I42 is swung outwardly the rolling of the gear I31 on the gear I36 will cause the shaft I38 to be moved in a direction to advance the hook-beak I51 relative to the needle 10'. The gear I50 rotates in a counter-clockwise direction, as viewed in Figure 10, and the teeth of the gear I5I are out on an angle so as to cause the beak I42 of the hook I42 to be retarded relative to the needle 1| when the hook I42 is swung outwardly. It will be understood that the above described condition is reversed when the hooks swing towards each other.

The feeding mechanism comprises a feed-bar I carrying a feed-dog I9I which extends through openings in the throat-plate 220 and cooperates with the presser-foot 83. The feedbar I90 is pivotally secured intermediate its ends by a pivot pin I92 to a lug I93 fixed to the base of the machine (Figure 4). In order to permit the feed-bar I90 to slide back and forth the pivot.

pin I92 is received by an apertured block I95 (Figure 4) which is slidable in a slot I96 in the feed-bar. The feed-bar I90 is formed with an apertured boss I91. The aperture in the boss receives a slide-pin I98 which is held in position by a screw 2 (Figure 16). The pin I98 is longitudinally slidable in a bore in the enlarged boss I99 formed on a strap 209 which embraces an eccentric 20I fixed on the shaft I08. The slide-pin I98 is formed with an enlarged portion 2I0 which is formed eccentric to the pin. The screw 2I I may be loosened and a screw driver may be inserted in the slot 2I2 formed in the pin I98. The pin may then be turned to adjust the work-engaging surface of the feed-dog I9I relative to the top surface of the throat-plate 220.

Fixed to the feed-bar I90 by the set screw 22I is a second s ide-pin 222 arranged substantially at right angles to the slide-pin I98 and having an eccentric portion 223 which is received in a suitable aperture in the feed-bar. The pin 222 is slidable in an aperture in the boss 224 of a strap 225 which embraces the adjustable eccentric 225. It will be obvious that the feed- 75 dog l9! may be centered in the slot in the throatplate by adjusting the pin 222 about its longi-- tudinal axis.

The adjustable eccentric is carried by a plate 226 slidable in, and adjustable relative to, a disk 22! which is fixed to the shaft I 08. The adjustable eccentric is the same as that shown and described in the patent to W. Myers, No. 2,063,264, dated Dec. 8, 1936, to which reference may be had for a more complete description. A stop pin 228 (Figure 4) is carried by the bed ill for tlr. purpose of adjusting the eccentric 225 to thereby vary the amount of feeding movement imparted to the feed-dog.

It will be observed that the slide-pin I98 is located above the shaft I08. This construction places the load over the shaft and prevents cramping of the parts.

From the foregoing description considered in connection with the accompanying drawings, the construction, manner of operation and several advantages of my improved sewing machine will be clearly and fully understood. It is apparent that such a machine has a wide variety of uses, and it will be understood that the form, construction and arrangement of the elements employed may be varied. Therefore, the privilege is reserved of resorting to all such legitimate changes therein as may be fairly embodied within the spirit and scope of the appended claims.

Having thus set forth the nature of the invention, what I claim herein is:

1. A sewing machine having, in combination, a pair of slide-rods, a needle-bar bracket secured to the first slide-rod and slidable on the second, a second needle-bar bracket secured to'the second slide-rod and slidable on the first, needlebars journaled in said brackets, and means for reciprocating said needle-bars.

2. A sewing machine having, in combination, a pair of slide-rods, a needle-bar bracket secured to the first slide-rod and slidable on the second, a second needle-bar bracket secured to the second slide-rod and slidable on' the first, needlebars journaled in said brackets, means for actuating said needle-bars and means for vibrating said rods.

3. In combination with a sewing machine having a supporting head, two spaced horizontally disposed and parallel bars carried by said head, two bearing brackets one of which is fixed to the first of the bars and slidable on the second and the other fixed to the second of said bars and slidable on the first, needle-bars journaled in said bearing brackets, and means for reciprocating said needle-bars.

4. In combination with a sewing machine having a supporting head, two spaced horizontally disposed and parallel bars carried by said head, two bearing brackets one of which is adjustably secured to the first of the bars and slidable on the second and the other adjustably fixed to the second of said bars and slidable on the first, needle-bars journaled in said bearing brackets, and means for reciprocating said needle-bars.

5. In combination with a sewing machine having a supporting head, two spaced horizontally disposed and parallel bars carried by said head, two bearing brackets one of which is adjustably secured to the first of the bars and slidable on the second and the other adjustably fixed to the second of said bars and slidable on the first, needle-bars journaled in said bearing brackets, means for reciprocating said needle-bars, and adjustable eccentrics forvibrating said bars.

6. A sewing machine having, in combination, a reciprocatory needle-bar carrying a needle, a loop-taker cooperating with said needle to form stitches, actuating means for said needle-bar and said loop-taker, a shaft driven by said actuating means, adjustable eccentrics on said shaft for vibrating said needle-bar and loop-taker laterally of the line of seam formation, and a single means for simultaneously adjusting said eccentrics.

7. A sewing machine having, in combination, a'reciprocatory needle-bar carrying a needle, a loop-taker coordinated with said needle to form stitches, adjustable eccentrics for vibrating said needle-bar and loop-taker laterally of the line of seam formation, linkage connecting said eccentrics whereby they are caused to move an equal amount in opposite directions, and means for arfiustlng one of said eccentrics.

8. A sewing machine having in combination, a reciprocatory needle, 9. loop-taker cooperating therewith to form stitches, means for actuating said needle and loop-taker, a pair of eccentrics for vibrating said needle and loop-taker laterally, means for simultaneously adjusting said eccentrics, a second reciprocatory needle, a looptaker cooperating therewith, a pair of eccentrics for vibrating said second needle and loop-taker laterally, and means for adjusting said eccentrics simultaneously.

9. In a zigzag sewing machine the combination of, a'reciprocatory needle, a rotary hook operable about a vertical axis and cooperating with said needle to form stitches, feeding mechanism for advanclngthe work, mechanism for vibrating said needle and hook laterally of the line of feed, said hook vibrating about a pivot point disposed at a distance from the axis of rotation of the hook and located in the direction of the line of feed, and means for maintaining the needle and hook in timed relation regardless of the amount of lateral throw.

10. In a zigzag sewing machine the combination of, a reciprocatory needle, a rotary hook cooperating with said needle to form stitches,

feeding mechanism for advancing the work,

means for simultaneously vibrating said needle and hook laterally of the line of seam forma-' ard and overhanging bracket-arm, a needle-bar actuating shaft located in said bracket-arm, a pair of needle-bars actuated thereby, a pair of rotary hooks located beneath said bed and cooperating with said needles to form stitches, a shaft located in the bracket-arm and arranged at right angles to said needle-bar actuating shaft, means for driving said last mentioned shaft from said needle-bar shaft, eccentrics located on opposite sides of said driving means, and mechanism connecting said hooks and needle-bars with said eccentrics whereby said needle-bars and the hooks may be vibrated laterally of the line of scam formation.

12. In a sewing machine having a work-support, reciprocatory needle-bars carrying needles and located above said work-support, a pair of hook-supporting frames pivotally supported at one end and arranged beneath said work-support for movement about vertical axes, rotary hooks carried by each of said frames and cooperating with said needles to form stitches, a bobbin-case opener carried by each of said frames, means for vibrating said needles laterally of the line of seam formation, and mechanism connected to the free ends of said hook-supporting frames for oscillating said frames about their vertical axes in timed relation with the vibratory movement of said needles.

13. In combination with a sewing machine, a pair of needle-bars, needles carried by said needle-bars, loop-takers cooperating with said nee dles to form stitches, means for vibrating said needle-bars laterally of the line of seam formation, mechanism for simultaneously vibrating said loop-takers laterally of the line of seam formation about vertical axes and means for maintaining said loop-takers in timed relation with said needles.

SYDNEY ZONIS.

CERTIFICATE OF (IJORRECTION.

Patent No. 2,207,1h1. July. 9, 191 0.

' SYDNEY ZONIS.

' Henry Van Arsdale, (Seal) Acting Conmis'sioner of Patents. 

